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Infrasonic Quartet Configuration


Cables needed:

Line Input -
(1) 1/4" stereo connector on Quartet end, (2) 1/8" mono connectors on LP-PAN end.

Speaker - (1) 1/4" stereo connector on Quartet end, appropriate connector(s) on speaker end. You will need a pair of speakers (or headphones) if you want to take full advantage of the sub-receiver in PowerSDR, which feeds the main receiver to the left channel, and the sub-receiver to the right channel.


Start by making sure you have downloaded the approprite driver at

The correct Windows driver as of Aug. 26, 2010 is

The pictures below are from driver version 1.14. Newer drivers may look somewhat different.

Open the Free Mixer panel, located at Programs>INFRASONIC>FREEMIXER. Configure it as shown below, to set the
Quartet card input (HW IN 1/2) to feed both PowerSDR (ASIO IN 1/2) and CW Skimmer (WDM IN 1/2) at the same time. It also shows the routing of PowerSDR (ASIO OUT 1/2) to the hardware output jack of Quartet (HW OUT 1/2). Just click on the appropriate boxes, and the program will create the correct routing.

Open the Quartet panel located at Programs>INFRASONIC>Quartet panel. Click on CONFIG and configure it as shown below.

Click on I/O and configure it as shown below. Set fader levels as shown for use with LP-PAN. If you haven't done the K3 buffer mod, the fader levels in the first mixer strip will need to be set a little higher.

Below is a picture of what the PowerSDR Audio Setup tab should look like for this card. You may or may not need the Expert mode selected. On my older PC, setting a latency of 2ms helped the card start reliably. All other settings should be matched exactly as shown, except "Line In Gain", "Mic In Gain" and "Output Voltage" which are meaningless in the context of LP-PAN. Note: With older versions of the driver, the Quartet card ASIO selection may not be listed as ASIO 2.2, since older drivers supported ASIO 2.0.

If you plan to use CW Skimmer simultaneously with PowerSDR, use the following pictures as a guideline for setting up Skimmer. Your
"Audio IF, Hz" setting will be different than mine. A ballpark setting can be found using this formula...

CW Pitch - Global Offset = Audio IF, Hz

CW Pitch is the setting in the K3. It should also be set in PowerSDR and LP-Bridge to match.

Global Offset is the setting in PowerSDR>Setup>SoftRock IF Stage tab. You will need to fine tune it after the initial setting. Use the default CW filter in the K3 when doing this. Make sure the DSP controls are set to NORmal, as they shift the Skimmer display if not.